Matrix code P1456

Hello,

There are several factors for that code to come on. It could be as simple as a lose or defective gas cap. It could also be a leak anywhere in the evaporative system, which could include the fuel tank or a faulty hose.
Have you made sure that your gas cap is on properly? Have you tried clearing the code?

Here is a video showing how to clear the code:

https://youtu.be/ahK_eucFi-k
https://youtu.be/iH92vcUWJzs

You also might find this article helpful:

https://www.2carpros.com/articles/how-emission-control-systems-work

I have attached a step by step procedure of diagnose and determine what is the cause for the error code in your vehicle.
Please let me know if you have any questions.

Thank you.